
Dr Sam Johns
BSc, PhD
Expertise
Current positions
Research Associate in Analytical Chemistry
School of Chemistry
Contact
Press and media
Many of our academics speak to the media as experts in their field of research. If you are a journalist, please contact the University’s Media and PR Team:
Research interests
In 2019, I began my PhD project entitled 'Historical Records of Climate Preserved in Biomolecular Components of Calendrically-dated Parchment Manuscripts and Seals' under the supervision of Dr Melanie Roffet-Salque (University of Bristol) and Professor Matthew Collins (University of Cambridge & University of Copenhagen). This research is co-funded by the European Research Council (Beasts2Craft) and the Carlsberg Foundation (ArcHives; PI: Professor Matthew Collins).
My PhD forms a part of two collaborative projects (Beasts2Craft and ArcHives) and comprises three main themes surrounding the analysis of lipids within parchment manuscripts and wax seals. This will be achieved by (1) investigating diachronic and geographical changes in the molecular composition of parchment manuscripts and wax seals by GC-MS and HT-GC-MS; (2) determining the isotopic composition of lipids by GC-C-IRMS and GC-TC-IRMS for the reconstruction of palaeodietry and palaeocliamtic records (3) validating novel compound-specific approaches for radiocarbon dating. By addressing these themes, we will test hypotheses surrounding the impact of historical events upon the documents; gain insight into past climatic events and make the first steps toward provenancing historical beeswax and parchments.
Publications
Recent publications
01/12/2024Assessing the effect of minimally invasive lipid extraction on parchment integrity by artificial ageing and integrated analytical techniques
Polymer Degradation and Stability
Minimally Invasive Vacuum-Aided Extraction Technique for the Lipid Analysis of Historic Parchment
Analytical Chemistry
Skin
Conservation of Books
ArcHives
Heritage Science
Beescapes - Extracting Pollen from Historical Danish Beeswax to Explore Honeybee Foraging
Palynology
Thesis
Historical Records of Climate Preserved in Biomolecular Components of Calendrically-Dated Parchment Manuscripts
Supervisors
Award date
01/10/2024